[1] W. L. Barnes, A. Dereux, and T. W. Ebbesen, Nature 424, 824 (2003).

[2] S. A. Maier, Plasmonics: Fundamentals and Applications (Springer, Bath, 2006).

[3] J. F. Li and Z. Y. Li, Chin. Phys. B 23, 047305 (2014).

[4] J. F. Li, H. L. Guo, and Z. Y. Li, Photon. Res. 1, 28 (2013).

[5] S. Feng, Y. Geng, K. Lau, and A. Poon, Opt. Lett. 37, 4035 (2012).

[6] P. Yang, R. Yan, and M. Fardy, Nano Lett. 10, 1529 (2010).

[7] S.-H. Wei and A. Zunger, Appl. Phys. Lett. 72, 2011 (1998).

[8] G. V. Naik, V. M. Shalaev, and A. Boltasseva, Adv. Mater. 25, 3264 (2013).

[9] R. Q. Zhang, Y. Lifshitz, and S.-T. Lee, Adv. Mater. 15, 635 (2003).

[10] X. Wang, L. C. Kimerling, J. Michel, and J. Liu, Appl. Phys. Lett. 102, 131116 (2013).

[11] K. C. Balram, R. M. Audet, and D. A. B. Miller, Opt. Express. 21, 10228 (2013).

[12] T. Kawase, A. Mura, K. Nishitani, Y. Kawai, K. Kawai, J. Uchikoshi, M. Morita, and K. Arima, J. Appl. Phys. 111, 126102 (2012).

[13] S. Mirabella, S. Cosentino, A. Gentile, G. Nicotra, N. Piluso, L. V. Mercaldo, F. Simone, C. Spinella, and A. Terrasi, Appl. Phys. Lett. 101, 011911 (2012).

[14] S. Cosentino, P. Liu, S. T. Le, S. Lee, D. Paine, A. Zaslavsky, D. Pacifici, S. Mirabella, M. Miritello, I. Crupi, and A. Terrasi, Appl. Phys. Lett. 98, 221107 (2011).

[15] P. Boucaud, V. Le Thanh, S. Sauvage, D. De′barre, and D. Bouchier, Appl. Phys. Lett. 74, 401 (1999).

[16] O. P. Pchelyakov, Y. B. Bolkhovityanov, A. V. Dvurechenski, L. V. Sokolov, A. I. Nikiforov, A. I. Yakimov, and B. Voigtl?nder, Semiconductors 34, 1291 (2000).

[17] J. Jain, A. Hryciw, and T. Baer, Nat. Photon. 6, 398 (2012).

[18] J. Liu, D. Cannon, and K. Wada, Appl. Phys. Lett. 87, 011110 (2005).

[19] J. Michel, J. Liu, and L. Kimerling, Nat. Photon. 4, 527 (2010).

[20] D. Miller, Proc. IEEE 97, 1166 (2009).

[21] X. L. Zhong and Z. Y. Li, Phys. Rev. B 88, 085101 (2013).

[22] S. Collin, F. Pardo, R. Teissier, and J.-L. Pelouard, Appl. Phys. Lett. 85, 194 (2004).

[23] X. L. Zhong and Z. Y. Li, J. Phys. Chem. C 116, 21547 (2012).

[24] J. Liu, X. L. Zhong, and Z. Y. Li, Chin. Phys. B 23, 047306 (2014).

[25] J. Fang, S. Qin, X. Zhang, and S. Chang, Chin. Opt. Lett. 10, 031601 (2012).

[26] Z. Liu, H. Zhong, Z. Guo, and B. Yang, Chin. Opt. Lett. 11, 083001 (2013).

[27] C. D’Andrea, J. Bochterle, and A. Toma, ACS Nano 7, 3522 (2013).

[28] F. Yi, H. Zhu, J. C. Reed, and E. Cubukcu, Nano Lett. 13, 1638 (2013).

[29] M. Borgstrom and J. Wallentin, IEEE J. Select. Top. Quant. Electron. 17, 1050 (2011).

[30] J. Y. Suh, M. D. Huntington, C. H. Kim, W. Zhou, M. R. Wasielewski, and T. W. Odom, Nano Lett. 12, 269 (2012).

[31] Z. Zhang, A. Weber-Bargioni, S. W. Wu, S. Dhuey, S. Cabrini, and P. J. Schuck, Nano Lett. 9, 4505 (2009).

[32] Z. Y. Li and Y. N. Xia, Nano Lett. 10, 243 (2010).

[33] J. Goodman, B. Draine, and P. Flatau, Opt. Lett. 16, 1198 (1991).